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SURF: Speeded Up Robust Features, ECCV 2006. Herbert Bay, Tinne Tuytelaars, and Luc Van Gool - page 14 / 22

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14

Matching

Fast indexing through the sign of the Laplacian for the underlying interest point

The sign of trace of the Hessian matrix

Trace = Lxx + Lyy

Either 0 or 1 (Hard thresholding, may have boundary effect …)

In the matching stage, compare features if they have the same type of contrast (sign)

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